Dear Experts,
If it is to be used for ASME Certification job not allowed. For ASME Non-Certification jobs, it is possible to make SORF, BLRF excepting WNRF. Please refer ASME B16.5. From WNRF Flange, you can make SORF, SWRF except Blind flange.
Hope, the above is clear to you.
Thanks & regards,
C. R. Gandhi